Method and system for testing accuracy of temperature sensor of nuclear power plant

Abstract

The invention relates to a nuclear power plant temperature sensor accuracy test method and system. The method comprises the following steps: determining a plurality of test temperatures; a temperature adjusting device is controlled to work according to the multiple test temperatures, so that the temperature adjusting device sequentially heats a heat-conducting medium in the temperature adjusting device to be equal to or close to the multiple test temperatures, the heat-conducting medium is arranged in the temperature adjusting device, and a tested temperature sensor is immersed in the heat-conducting medium; obtaining measurement temperatures of the tested temperature sensor when the heat-conducting medium is heated to each test temperature, and obtaining a plurality of to-be-judged temperatures corresponding to the plurality of test temperatures one by one; and judging whether the tested temperature sensor is qualified or not according to the plurality of to-be-judged temperatures and the plurality of test temperatures so as to output a judgment result. According to the invention, the measurement accuracy of the temperature sensor can be automatically tested, the test efficiency is high, the human error risk can be reduced, and the test accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant equipment maintenance, and in particular to a method and system for testing the accuracy of a temperature sensor in a nuclear power plant. Background Art

[0002] Temperature sensors are widely used in temperature measurement of various process system equipment and media in nuclear power plants. In order to ensure the measurement accuracy and reliability of temperature sensors, the measurement accuracy of the sensors needs to be tested regularly. At present, the calibration of temperature sensors at home and abroad is mainly achieved by manual testing, but manual calibration has many disadvantages. For example, the test results need to be saved manually, which requires a lot of manpower and time. In addition, the recording, observation and control of the test temperature are all manually implemented by the staff, resulting in a high risk of human error and poor test accuracy. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for testing the accuracy of a temperature sensor in a nuclear power plant.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a nuclear power plant temperature sensor accuracy testing method, comprising:

[0005] Determine multiple test temperatures;

[0006] The temperature regulating device is controlled to work according to the multiple test temperatures, so that the temperature regulating device heats the internal heat-conducting medium to a temperature equal to or close to the multiple test temperatures in sequence; wherein the temperature regulating device is provided with a heat-conducting medium, and the temperature sensor to be tested is immersed in the heat-conducting medium;

[0007] Acquire the measured temperature of the tested temperature sensor when the heat-conducting medium is heated to each of the test temperatures, and obtain a plurality of temperatures to be determined corresponding to the plurality of test temperatures;

[0008] Whether the tested temperature sensor is qualified is judged according to the multiple temperatures to be judged and the multiple test temperatures, so as to output a judgment result.

[0009] In some embodiments, determining a plurality of test temperatures comprises:

[0010] Get the temperature test range and test points;

[0011] A plurality of test temperatures are determined within the temperature test range according to a setting function; wherein the setting function comprises an equal division function.

[0012] In some embodiments, the temperature test range is 0° C. to 100° C., and the number of test points is 5.

[0013] In some embodiments, the temperature regulating device is further provided with a standard thermometer immersed in the heat conducting medium;

[0014] The step of controlling the temperature regulating device to work according to the plurality of test temperatures comprises:

[0015] Controlling the temperature regulating device to heat the heat conducting medium;

[0016] Acquiring the real-time measured temperature of the standard thermometer during the heating process;

[0017] Determine whether the absolute value of the temperature difference between the real-time measured temperature and the closest test temperature is less than the set temperature;

[0018] When the absolute value of the temperature difference is less than the set temperature, the heating power of the temperature regulating device is reduced until the heat-conducting medium is heated to a temperature equal to or close to the closest test temperature.

[0019] In some embodiments, the set temperature ranges from 1.5°C to 3°C.

[0020] In some embodiments, judging whether the tested temperature sensor is qualified according to the plurality of temperatures to be judged and the plurality of test temperatures includes:

[0021] Calculating the error value between each of the to-be-determined temperatures and the corresponding test temperature to obtain a plurality of error values;

[0022] respectively determining whether each of the error values ​​is within a set error range;

[0023] When at least one of the error values ​​is not within the set error range, the tested temperature sensor is determined to be unqualified;

[0024] When all the error values ​​are within the set error range, the tested temperature sensor is determined to be qualified.

[0025] In some embodiments, the setting error range is ±3%.

[0026] The present invention also constructs a nuclear power plant temperature sensor accuracy testing system, including a temperature regulating device and a control module;

[0027] A heat-conducting medium is provided inside the temperature regulating device, and the temperature sensor to be tested is immersed in the heat-conducting medium during the test;

[0028] The control module includes a determination unit, a temperature control unit, a temperature acquisition unit and a judgment unit;

[0029] The determination unit is used to determine a plurality of test temperatures;

[0030] The temperature control unit is used to control the temperature regulating device to work according to the multiple test temperatures, so that the temperature regulating device heats the internal heat-conducting medium to be equal to or close to the multiple test temperatures in sequence;

[0031] The temperature acquisition unit is used to acquire the measured temperature of the tested temperature sensor when the heat-conducting medium is heated to each of the test temperatures, and obtain a plurality of temperatures to be determined corresponding to the plurality of test temperatures;

[0032] The judgment unit is used to judge whether the tested temperature sensor is qualified according to the multiple temperatures to be judged and the multiple test temperatures, and output the judgment result.

[0033] In some embodiments, the nuclear power plant temperature sensor accuracy testing system further comprises a standard thermometer immersed in the thermal conductive medium;

[0034] The temperature acquisition unit is also used to acquire the real-time measured temperature of the standard thermometer during the heating process;

[0035] The temperature control unit is used to control the temperature adjustment device to heat the heat-conducting medium, and when the absolute value of the temperature difference between the real-time measured temperature and the closest test temperature is less than the set temperature, reduce the heating power of the temperature adjustment device until the heat-conducting medium is heated to a temperature equal to or close to the closest test temperature.

[0036] In some embodiments, the nuclear power plant temperature sensor accuracy test system further includes a human-computer interaction unit for obtaining a temperature test range and a number of test points;

[0037] The determination unit is used to determine a plurality of test temperatures within the temperature test range according to a set function; wherein the set function includes an equal division function.

[0038] The implementation of the present invention has the following beneficial effects: providing a method for testing the accuracy of a temperature sensor in a nuclear power plant; first, determining a plurality of test temperatures; then, controlling the temperature regulating device to work according to the plurality of test temperatures, so that the temperature regulating device heats the internal heat-conducting medium to be equal to or close to the plurality of test temperatures in sequence; then, obtaining the measured temperature of the tested temperature sensor when the heat-conducting medium is heated to each test temperature, so as to obtain a plurality of temperatures to be determined corresponding to the plurality of test temperatures one by one; finally, outputting a determination result according to the plurality of temperatures to be determined and the plurality of test temperatures; the present invention can automatically test the measurement accuracy of the temperature sensor, not only has high test efficiency, but also can reduce the risk of human error, improve test accuracy, and play a positive role in shortening the maintenance period of the nuclear power plant, saving human resources and improving operation stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0040] Figure 1 is a flowchart of a method for testing the accuracy of a temperature sensor in a nuclear power plant according to an embodiment of the present invention;

[0041] Figure 2 is a flow chart of a temperature adjustment process of a heat transfer medium in one embodiment of the present invention;

[0042] Figure 3 is a flowchart of a procedure for determining whether a tested temperature sensor is qualified in one embodiment of the present invention;

[0043] Figure 4 It is a structural schematic diagram of a nuclear power plant temperature sensor accuracy testing system in one embodiment of the present invention;

[0044] Figure 5 It is a schematic diagram of the structure of a control module in one embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0046] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0047] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0048] Figure 1 The program flow chart of a method for testing the accuracy of a temperature sensor in a nuclear power plant in one embodiment of the present invention is applied to a control module and can automatically test the measurement accuracy of a temperature sensor test. The method includes steps S1, S2, S3 and S4.

[0049] See also Figure 1 Step S1 includes: determining multiple test temperatures. The purpose of this step is to determine multiple test temperatures that are different from each other to prepare for the test work.

[0050] In one embodiment, multiple test temperatures can be determined by performing the following steps: first, obtaining a temperature test range and a number of test points; then, determining multiple test temperatures within the temperature test range according to a set function; wherein the set function includes an equal division function or a random number generation function, the temperature test range can be 0°C to 100°C, and the number of test points can be 5.

[0051] Since the operation of a nuclear power plant involves a large number of temperature protection thresholds in different temperature ranges, in order to determine whether the measurement accuracy of the temperature sensor in the temperature range near the temperature protection threshold meets the requirements, in this embodiment, the temperature test range and the number of test points can be set by operating the human-computer interaction unit (such as a touch screen, mouse, keyboard, voice control module, etc.).

[0052] For ease of understanding, this embodiment will take the temperature test range of 0℃ to 100℃ and the number of test points as an example to illustrate the process of determining the test temperature: first, the staff can set the temperature test range to 0℃ to 100℃ and the number of test points to 5 according to needs, and then the software will automatically execute the setting function to determine 5 different test temperatures within 0℃ to 100℃.

[0053] In one embodiment, the equal division function can be expressed as: T(n)=n*Tmax / N, where T(n) represents the nth test temperature (n is a positive integer), Tmax represents the upper limit of the temperature test range, and N represents the number of test points (N≥n). The random number generation function can be an existing random function, such as rand(), srand(), etc.

[0054] Step S2 includes: controlling the temperature regulating device to work according to a plurality of test temperatures, so that the temperature regulating device heats the heat-conducting medium inside to a temperature equal to or close to a plurality of test temperatures in sequence; wherein, a heat-conducting medium is provided in the temperature regulating device, and the sensing part of the tested temperature sensor is immersed in the heat-conducting medium. Specifically, the temperature regulating device can be an existing water bath heating device, as long as it can heat the heat-conducting medium, and no specific limitation is made here. In order to save costs and the difficulty of obtaining the heat-conducting medium, the heat-conducting medium is preferably water, but since the melting point of water at standard atmospheric pressure is 0°C and the boiling point is 100°C, the maximum test range of the temperature test range is 0°C to 100°C, and the temperature actually required to be measured by the tested temperature sensor is greater than 100°C, such as the primary circuit coolant temperature, so the heat-conducting medium can also be the coolant used in the nuclear power plant, and the type of the heat-conducting medium can be determined by the actual measurement object of the tested temperature sensor, and of course, other media can be used instead, such as a heat-conducting medium with a boiling point higher than the highest temperature of the actual measurement object.

[0055] Since the test temperature may be lower than normal temperature, in order to meet the test temperature requirements, in one embodiment, a cooled or condensed heat-conducting medium may be added before the temperature adjustment device is heated as a pre-test preparation, so that the initial temperature of the heat-conducting medium is not greater than the lower limit of the temperature test range.

[0056] See also Figure 1 In one embodiment, a standard thermometer is also provided in the temperature regulating device, and the sensing part of the standard thermometer is immersed in the heat-conducting medium. Figure 2 As shown, the temperature adjustment of the heat transfer medium can be achieved by executing step S21, step S22, step S23 and step S24.

[0057] See also Figure 2 , step S21 includes: controlling the temperature regulating device to heat the heat-conducting medium. In this step, if the temperature regulating device is an adjustable water bath type heating device with a communication function, the control module can communicate with the temperature regulating device to send relevant control instructions to it, thereby realizing power regulation of the temperature regulating device. If the temperature regulating device is a water bath type heating device without a communication function, the power of the temperature regulating device can be controlled by using a switching device to realize power control of the temperature regulating device. For example, a relay is connected in series between the temperature regulating device and its power supply, and then the control module is connected to the relay in communication to control the excitation or demagnetization of the relay, thereby controlling the power on or off of the temperature regulating device to realize power control.

[0058] See also Figure 2 , step S22 includes: obtaining the real-time measured temperature of the standard thermometer during the heating process. In this step, the control module can obtain the real-time measured temperature by communicating with the standard thermometer, and the standard thermometer can be an existing high-precision electronic thermometer with an accuracy range of no more than ±0.2°C, without specific limitation.

[0059] See also Figure 2 , step S23 includes: judging whether the absolute value of the temperature difference between the real-time measured temperature and the closest test temperature is less than the set temperature; wherein the set temperature can range from 1.5°C to 3°C. In this step, the real-time measured temperature will only be subtracted from the test temperature that is greater than its temperature value and closest to it to obtain the absolute value of the temperature difference. For example, the five test temperatures are 20°C, 40°C, 60°C, 80°C and 100°C, respectively. Assuming that the real-time measured temperature is 38.5°C, the test temperature that is greater than the real-time measured temperature and closest to it is 40°C, so the absolute value of the temperature difference can be calculated to be 1.5°C (|38.5°C-40°C|). It should be understood that when the real-time measured temperature is 40.5°C, the test temperature that is greater than the real-time measured temperature and closest to it will be converted to 60°C.

[0060] See also Figure 2 , step S24 includes: when the absolute value of the temperature difference is less than the set temperature, the heating power of the temperature regulating device is reduced until the heat-conducting medium is heated to or close to the closest test temperature. Since the temperature regulating device has heating inertia, that is, even if the temperature regulating device is powered off, the heat-conducting medium will continue to heat up due to thermal inertia, which eventually leads to the actual temperature being higher than the target test temperature. If the heat-conducting medium is added to cool down the target test temperature while waiting for the heat-conducting medium to cool down, it is not only troublesome to operate, but also easy to cause the temperature to be too low if not careful. The method of waiting for the heat-conducting medium to cool down naturally takes a long time, which will reduce the test efficiency. To avoid this situation, the temperature regulating device cannot be controlled to directly heat the heat-conducting medium to the test temperature. In this step, when the absolute value of the temperature difference is detected to be less than the set temperature, it indicates that the temperature of the heat-conducting medium is close to the closest test temperature. At this time, the control module will output the corresponding control instruction or control the on-time ratio (i.e., duty cycle) of the relay within the cycle time to reduce the output power of the temperature regulating device, so that the heating power is reduced or even the heating is stopped when necessary, so that the heat-conducting medium is heated to or as close to the closest test temperature as possible. It should be noted that the absolute value of the temperature difference is less than 0.1°C, which can be regarded as the heat-conducting medium being heated to the closest test temperature, and step S3 can be executed at this time. Furthermore, after step S3 is completed, if the heat-conducting medium is not heated to or close to the maximum test temperature, the output power of the temperature regulating device is increased or restored so that the temperature regulating device continues to heat the heat-conducting medium.

[0061] It should be noted that in this step, the heat-conducting medium is heated by water bath heating, and then the temperature sensor and the standard thermometer are heated by the heat-conducting medium. Since the heat-conducting medium has a certain volume, the heat-conducting medium will not change suddenly. Compared with directly using a heating device to heat the temperature sensor and the standard thermometer, this method of indirectly heating the temperature sensor and the standard thermometer with the heat-conducting medium can avoid sudden changes in the measured temperature, which helps to reduce temperature change noise. Moreover, the heat-conducting medium is immersed in the temperature sensor and the standard thermometer, which helps the temperature sensor and the standard thermometer to more accurately measure the temperature of the heat-conducting medium, which plays a positive role in improving the test accuracy of the present invention.

[0062] See also Figure 1 , step S3 includes: obtaining the measured temperature of the tested temperature sensor when the heat-conducting medium is heated to each test temperature, and obtaining a plurality of temperatures to be determined corresponding to the plurality of test temperatures. In this step, each time the heat-conducting medium is heated to a temperature equal to or close to a certain test temperature, the control module communicates with the tested temperature sensor to obtain the corresponding measured temperature.

[0063] Since there will inevitably be time errors when executing software and hardware, if the measured temperature measured by the tested temperature sensor is immediately obtained when the heat-conducting medium is heated to the test temperature, there may be errors. In order to avoid this situation, in one embodiment, the step of obtaining the temperature to be determined may include: when the heat-conducting medium is heated to the test temperature each time, determine whether the time for which the temperature of the heat-conducting medium remains within the allowable error range of the corresponding test temperature is greater than the set time based on the real-time measured temperature output by the standard thermometer. If the real-time measured temperature remains within the allowable error range of the corresponding test temperature for longer than the set time, the measured temperature of the tested temperature sensor is obtained and recorded as the temperature to be determined. Among them, the allowable error range can be ±0.1°C, and the set time range can be 10 seconds to 20 seconds. For ease of understanding, taking one of the test temperatures as 20°C and the set time as 10 seconds as an example, when the real-time measured temperature reaches the range of 19.9°C to 20.1°C, the control module will determine that the heat medium has been heated to a test temperature equal to or close to 20°C. At this time, the control module will continue to obtain the real-time measured temperature output by the standard thermometer and control the temperature adjustment device to maintain a constant output power. If the real-time measured temperature is maintained at 19.9°C to 20.1°C for more than 10 seconds, the measured temperature output by the tested temperature sensor is obtained, and the measured temperature is recorded as the temperature to be determined corresponding to 20°C.

[0064] See also Figure 1 Step S4 includes: judging whether the tested temperature sensor is qualified according to a plurality of temperatures to be judged and a plurality of test temperatures, and outputting a judgment result.

[0065] In one embodiment, Figure 3 As shown, whether the tested temperature sensor is qualified can be determined by executing step S41, step S42, step S43 and step S44.

[0066] See also Figure 3 , step S41 includes: respectively calculating the error value between each temperature to be determined and the corresponding test temperature to obtain multiple error values. In this step, the calculation formula of the error value can be: [(t(n)-T(n)] / T(n), t(n) represents the measured temperature (i.e., the nth temperature to be determined) measured by the tested temperature sensor when the heat-conducting medium is heated to the nth test temperature, and T(n) represents the nth test temperature.

[0067] See also Figure 3 Step S42 includes: determining whether each error value is within a set error range. The set error range may be ±3%. This step determines whether each error value is within the set error range.

[0068] See also Figure 3, step S43 includes: when there is at least one error value that is not within the set error range, determining that the tested temperature sensor is unqualified.

[0069] See also Figure 3 , step S44 includes: when all error values ​​are within the set error range, determining that the tested temperature sensor is qualified.

[0070] It can be understood that the implementation of the technical solution of the present invention can realize automatic testing of the measurement accuracy of the temperature sensor, which not only has high test efficiency, but also reduces the risk of human error and improves test accuracy, which plays a positive role in shortening the maintenance period of nuclear power plants, saving human resources and improving operational stability.

[0071] The present invention also provides a nuclear power plant temperature sensor accuracy test system, see Figure 4 The system may include a temperature regulating device 1 and a control module 2 .

[0072] A heat-conducting medium is provided inside the temperature regulating device 1 , and during testing, the sensing portion of the tested temperature sensor 4 is immersed in the heat-conducting medium, so that the tested temperature sensor 4 can measure the temperature of the heat-conducting medium.

[0073] See also Figure 5 The control module 2 may include a determination unit 21 , a temperature control unit 22 , a temperature acquisition unit 23 and a judgment unit 24 .

[0074] The determination unit 21 is used to determine a plurality of test temperatures.

[0075] The temperature control unit 22 is used to control the operation of the temperature regulating device according to the multiple test temperatures, so that the temperature regulating device heats the internal heat-conducting medium in turn to be equal to or close to the multiple test temperatures.

[0076] The temperature acquisition unit 23 is used to acquire the measured temperature of the tested temperature sensor 4 when the heat-conducting medium is heated to each test temperature, and obtain a plurality of temperatures to be determined corresponding to the plurality of test temperatures.

[0077] The judgment unit 24 is used to judge whether the tested temperature sensor 4 is qualified according to multiple temperatures to be judged and multiple test temperatures, and output the judgment result. Specifically, the process of the judgment unit 24 judging whether the tested temperature sensor 4 is qualified can be: respectively calculating the error value between each temperature to be judged and the corresponding test temperature to obtain multiple error values; respectively determining whether each error value is within a set error range; when there is at least one error value that is not within the set error range, judging that the tested temperature sensor 4 is unqualified; when all error values ​​are within the set error range, judging that the tested temperature sensor 4 is qualified.

[0078] In one embodiment, Figure 5 As shown, the nuclear power plant temperature sensor accuracy test system may also include a standard thermometer 3, the sensing part of which is immersed in the heat-conducting medium so that the standard thermometer 3 can measure the temperature of the heat-conducting medium. Accordingly, the temperature acquisition unit 23 is also used to obtain the real-time measured temperature of the standard thermometer 3 during the heating process. The temperature control unit 22 is used to control the temperature adjustment device to heat the heat-conducting medium, and when the absolute value of the temperature difference between the real-time measured temperature and the closest test temperature is less than the set temperature, the heating power of the temperature adjustment device is reduced until the heat-conducting medium is heated to a temperature equal to or close to the closest test temperature.

[0079] In one embodiment, Figure 5 As shown, the nuclear power plant temperature sensor accuracy test system may also include a human-computer interaction unit 5, which is used to obtain the temperature test range and the number of test points according to the operation of the staff. Accordingly, the determination unit 21 is used to determine multiple test temperatures within the temperature test range according to a set function; wherein the set function includes an equal division function or a random number generation function. Furthermore, the human-computer interaction unit 5 may be a touch screen, so that the system may also display the judgment result through the human-computer interaction unit 5.

[0080] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0081] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0082] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0083] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A method for testing the accuracy of a temperature sensor in a nuclear power plant, characterized in that: include: Determine multiple test temperatures; The temperature regulating device is controlled to work according to the multiple test temperatures, so that the temperature regulating device heats the internal heat-conducting medium to a temperature equal to or close to the multiple test temperatures in sequence; wherein the temperature regulating device is provided with a heat-conducting medium, and the temperature sensor to be tested is immersed in the heat-conducting medium; Acquire the measured temperature of the tested temperature sensor when the heat-conducting medium is heated to each of the test temperatures, and obtain a plurality of temperatures to be determined corresponding to the plurality of test temperatures; Whether the tested temperature sensor is qualified is judged according to the multiple temperatures to be judged and the multiple test temperatures, so as to output a judgment result.

2. The method for testing the accuracy of temperature sensors in nuclear power plants according to claim 1, characterized in that: The determining of a plurality of test temperatures comprises: Get the temperature test range and test points; A plurality of test temperatures are determined within the temperature test range according to a setting function; wherein the setting function comprises an equal division function.

3. The method for testing the accuracy of temperature sensors in nuclear power plants according to claim 2, characterized in that: The temperature test range is 0°C to 100°C, and the number of test points is 5.

4. The method for testing the accuracy of temperature sensors in nuclear power plants according to claim 1, characterized in that: The temperature regulating device is also provided with a standard thermometer immersed in the heat conducting medium; The step of controlling the temperature regulating device to work according to the plurality of test temperatures comprises: Controlling the temperature regulating device to heat the heat conducting medium; Acquiring the real-time measured temperature of the standard thermometer during the heating process; Determine whether the absolute value of the temperature difference between the real-time measured temperature and the closest test temperature is less than the set temperature; When the absolute value of the temperature difference is less than the set temperature, the heating power of the temperature regulating device is reduced until the heat-conducting medium is heated to a temperature equal to or close to the closest test temperature.

5. The method for testing the accuracy of temperature sensors in nuclear power plants according to claim 4, characterized in that: The set temperature ranges from 1.5°C to 3°C.

6. The method for testing the accuracy of a temperature sensor in a nuclear power plant according to any one of claims 1 to 5, characterized in that: The step of judging whether the tested temperature sensor is qualified according to the plurality of temperatures to be judged and the plurality of test temperatures comprises: Calculating the error value between each of the to-be-determined temperatures and the corresponding test temperature to obtain a plurality of error values; respectively determining whether each of the error values ​​is within a set error range; When at least one of the error values ​​is not within the set error range, the tested temperature sensor is determined to be unqualified; When all the error values ​​are within the set error range, the tested temperature sensor is determined to be qualified.

7. The method for testing the accuracy of temperature sensors in nuclear power plants according to claim 6, characterized in that: The setting error range is ±3%.

8. A nuclear power plant temperature sensor accuracy test system, characterized in that: including a temperature regulating device and a control module; A heat-conducting medium is provided inside the temperature regulating device, and the temperature sensor to be tested is immersed in the heat-conducting medium during the test; The control module includes a determination unit, a temperature control unit, a temperature acquisition unit and a judgment unit; The determination unit is used to determine a plurality of test temperatures; The temperature control unit is used to control the temperature regulating device to work according to the multiple test temperatures, so that the temperature regulating device heats the internal heat-conducting medium to be equal to or close to the multiple test temperatures in sequence; The temperature acquisition unit is used to acquire the measured temperature of the tested temperature sensor when the heat-conducting medium is heated to each of the test temperatures, and obtain a plurality of temperatures to be determined corresponding to the plurality of test temperatures; The judgment unit is used to judge whether the tested temperature sensor is qualified according to the multiple temperatures to be judged and the multiple test temperatures, and output a judgment result.

9. The nuclear power plant temperature sensor accuracy test system according to claim 8, characterized in that: Also included is a standard thermometer immersed in the thermally conductive medium; The temperature acquisition unit is also used to acquire the real-time measured temperature of the standard thermometer during the heating process; The temperature control unit is used to control the temperature adjustment device to heat the heat-conducting medium, and when the absolute value of the temperature difference between the real-time measured temperature and the closest test temperature is less than the set temperature, reduce the heating power of the temperature adjustment device until the heat-conducting medium is heated to a temperature equal to or close to the closest test temperature.

10. The nuclear power plant temperature sensor accuracy test system according to claim 9, characterized in that: It also includes a human-computer interaction unit for obtaining the temperature test range and the number of test points; The determination unit is used to determine a plurality of test temperatures within the temperature test range according to a set function; wherein the set function includes an equal division function.

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